Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Retarded or delayed type
Patent
1982-03-08
1984-01-10
Rubinson, G. Z.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Retarded or delayed type
179115R, 179117, 179119R, 335231, H04R 900
Patent
active
044254822
ABSTRACT:
The disclosure relates to a ring armature electroacoustic transducer adapted for use as the receiver for telephone sets and for other purposes. The exemplary embodiment comprises the following elements coaxial about a common vertical axis: (a) a cylindrical ring permanent magnet (15) of Fe-Cr-Co material, (b) an annular disc upper pole piece (20) seated on magnet 15 and having at its inner margin a downwardly salient annular boss (30) providing an upper pole tip, (c) a lower pole piece (35) providing an annular lower pole tip (37) and aflange (36) coupling such tip (37) to the bottom of the magnet, (d) an armature support (40) within the magnet (15), (e) an annular disc armature (50) seated on the support (40), (f) a diaphragm (60) on the armature (50), and (g) a terminal plate (45) supporting such elements. The armature (50) is seated on a circular edge (90) on the support (40). The support (40), lower pole piece (35) and plate (45) form a unitary structure. The upper pole piece (20) has an external frustroconical bevel (25) at its outer margin.
REFERENCES:
patent: 2170571 (1939-08-01), Mott
patent: 2249160 (1941-07-01), Mott
patent: 2506609 (1950-05-01), Mott
patent: 2506624 (1950-05-01), Wirsching
patent: 2520640 (1950-08-01), Kreisel
patent: 2520646 (1950-08-01), Mott
patent: 2566849 (1951-09-01), Mott
patent: 2566850 (1951-09-01), Mott
patent: 2567365 (1951-09-01), Dalton
patent: 4075437 (1978-02-01), Chin et al.
patent: 4258234 (1981-03-01), Bordelon et al.
Permanent Magnets and Their Application; by Parker et al.; Wiley 1962 pp. 153,154.
The Ring Armature Telephone Receiver, by Mott et al; Bell System Tech. Journal, vol. 50 Jan. 1951; pp. 110-140.
Bordelon Chester M.
Hunt Richard M.
Wheeler Robert A.
Byrd Danita R.
Kip, Jr. R. F.
Rubinson G. Z.
Western Electric Company
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